Union Butterfield Self-Locking Taps

Dormer Pramet puts a lock on fastener costs with its Union Butterfield brand of self-locking taps. Utilizing specialized production equipment, this self-locking thread form can be produced on straight flute, spiral flute spiral point, roll form and even on the Union Butterfield line of high performance taps.

With improved holding power that lasts, the Union Butterfield self-locking tap design eliminates time intensive disassembly and assembly procedures and costly fasteners, chemical bonds, nylon plugs or other devices to maintain tightness.

A 30° wedge lock on the female thread creates a continuous spiral contact along the entire thread length for improved holding power versus standard thread forms.

Clamp load forces with the Union Butterfield self-locking thread design are spread evenly across all threads as compared to a conventional 60° thread form that puts clamping force only on the first few threads with the other threads receiving limited or not contact at all, eliminating thread stripping.